J.: thank you for your thorough reply. People have very short memories. I grew up in a town (in Europe) that had one of the earliest eruvim in europe-and it was based on many kulos- more than the kulos used in boro park or london. No one has ever said that it is not a good eruv- at most, some people did not carry,as a ‘chumro’ for themselves. And certainly, no one ever called the people who used the eiruv “mecahllelei shabos” Chas vesholom.
What happened in london with the eiruv is a scandal and has little to do with halocho. It became a political matter and I think that some of the opponents did not exactly add to their prestige by calling other frum people “mechallelei shabbos”.Certain events that happened subsequently have weakened the opponent’s hand considerably. “Dai lechakimah beremizah”
Thanks for your post!